/* Copyright (C) 2017-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <unistd.h>

#include <errno.h>

#include <fcntl.h>

#include <sys/wait.h>

#include <support/check.h>

/* Try executing "/bin/sh -c true", using FD opened on /bin/sh.  */

static int

try_fexecve (int fd)

{

  pid_t pid = fork ();

  if (pid == 0)

    {

      static const char *const argv[] = {

	"/bin/sh", "-c", "true", NULL

      };

      fexecve (fd, (char *const *) argv, environ);

      _exit (errno);

    }

  if (pid < 0)

    FAIL_RET ("fork failed: %m");

  pid_t termpid;

  int status;

  termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));

  if (termpid == -1)

    FAIL_RET ("waitpid failed: %m");

  if (termpid != pid)

    FAIL_RET ("waitpid returned %ld != %ld",

	      (long int) termpid, (long int) pid);

  if (!WIFEXITED (status))

    FAIL_RET ("child hasn't exited normally");

  /* If fexecve is unimplemented mark this test as UNSUPPORTED.  */

  if (WEXITSTATUS (status) == ENOSYS)

    FAIL_UNSUPPORTED ("fexecve is unimplemented");

  if (WEXITSTATUS (status) != 0)

    {

      errno = WEXITSTATUS (status);

      FAIL_RET ("fexecve failed: %m");

    }

  return 0;

}

static int

do_test (void)

{

  int fd;

  int ret;

  fd = open ("/bin/sh", O_RDONLY);

  if (fd < 0)

    FAIL_UNSUPPORTED ("/bin/sh cannot be opened: %m");

  ret = try_fexecve (fd);

  close (fd);

#ifdef O_PATH

  fd = open ("/bin/sh", O_RDONLY | O_PATH);

  if (fd < 0)

    FAIL_UNSUPPORTED ("/bin/sh cannot be opened (O_PATH): %m");

  ret |= try_fexecve (fd);

  close (fd);

#endif

  return ret;

}

#include <support/test-driver.c>